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I also struggled with the RT_LIBRARY-NOTFOUND issue and managed to solved it thanks to @duviros 's answer from #q207608 (check it out his little tutorial helped me a lot).

In ordrer to solve the RT_LIBRARY you have to add this line in your toolchain.cmake file :

# Set the target architecture
set(CMAKE_LIBRARY_ARCHITECTURE arm-linux-gnueabihf)

Replace arm-linux-gnueabihf with your compiler (but it should be the same if you are cross compiling for raspberry) and you shouldn't get the error anymore.